forked from OSchip/llvm-project
443 lines
13 KiB
LLVM
443 lines
13 KiB
LLVM
; RUN: opt -functionattrs -attributor -attributor-manifest-internal -attributor-disable=false -attributor-max-iterations-verify -attributor-max-iterations=10 -S < %s | FileCheck %s
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;
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; Test cases specifically designed for the "no-capture" argument attribute.
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; We use FIXME's to indicate problems and missing attributes.
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;
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; TEST comparison against NULL
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;
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; int is_null_return(int *p) {
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; return p == 0;
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; }
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;
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; FIXME: no-capture missing for %p
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; CHECK: define i32 @is_null_return(i32* readnone %p)
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define i32 @is_null_return(i32* %p) #0 {
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entry:
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%cmp = icmp eq i32* %p, null
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%conv = zext i1 %cmp to i32
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ret i32 %conv
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}
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; TEST comparison against NULL in control flow
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;
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; int is_null_control(int *p) {
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; if (p == 0)
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; return 1;
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; if (0 == p)
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; return 1;
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; return 0;
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; }
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;
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; FIXME: no-capture missing for %p
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; CHECK: define i32 @is_null_control(i32* readnone %p)
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define i32 @is_null_control(i32* %p) #0 {
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entry:
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%retval = alloca i32, align 4
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%cmp = icmp eq i32* %p, null
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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store i32 1, i32* %retval, align 4
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br label %return
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if.end: ; preds = %entry
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%cmp1 = icmp eq i32* null, %p
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br i1 %cmp1, label %if.then2, label %if.end3
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if.then2: ; preds = %if.end
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store i32 1, i32* %retval, align 4
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br label %return
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if.end3: ; preds = %if.end
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store i32 0, i32* %retval, align 4
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br label %return
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return: ; preds = %if.end3, %if.then2, %if.then
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%0 = load i32, i32* %retval, align 4
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ret i32 %0
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}
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; TEST singleton SCC
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;
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; double *srec0(double *a) {
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; srec0(a);
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; return 0;
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; }
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;
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; CHECK: define noalias nonnull align 536870912 dereferenceable(4294967295) double* @srec0(double* nocapture readnone %a)
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define double* @srec0(double* %a) #0 {
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entry:
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%call = call double* @srec0(double* %a)
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ret double* null
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}
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; TEST singleton SCC with lots of nested recursive calls
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;
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; int* srec16(int* a) {
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; return srec16(srec16(srec16(srec16(
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; srec16(srec16(srec16(srec16(
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; srec16(srec16(srec16(srec16(
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; srec16(srec16(srec16(srec16(
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; a
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; ))))))))))))))));
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; }
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;
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; Other arguments are possible here due to the no-return behavior.
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;
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; CHECK: define noalias nonnull align 536870912 dereferenceable(4294967295) i32* @srec16(i32* nocapture readnone %a)
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define i32* @srec16(i32* %a) #0 {
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entry:
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%call = call i32* @srec16(i32* %a)
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; CHECK: %call
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; CHECK-NEXT: unreachable
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%call1 = call i32* @srec16(i32* %call)
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%call2 = call i32* @srec16(i32* %call1)
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%call3 = call i32* @srec16(i32* %call2)
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%call4 = call i32* @srec16(i32* %call3)
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%call5 = call i32* @srec16(i32* %call4)
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%call6 = call i32* @srec16(i32* %call5)
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%call7 = call i32* @srec16(i32* %call6)
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%call8 = call i32* @srec16(i32* %call7)
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%call9 = call i32* @srec16(i32* %call8)
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%call10 = call i32* @srec16(i32* %call9)
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%call11 = call i32* @srec16(i32* %call10)
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%call12 = call i32* @srec16(i32* %call11)
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%call13 = call i32* @srec16(i32* %call12)
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%call14 = call i32* @srec16(i32* %call13)
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%call15 = call i32* @srec16(i32* %call14)
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ret i32* %call15
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}
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; TEST SCC with various calls, casts, and comparisons agains NULL
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;
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; CHECK: define dereferenceable_or_null(4) float* @scc_A(i32* readnone returned dereferenceable_or_null(4) "no-capture-maybe-returned" %a)
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;
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; CHECK: define dereferenceable_or_null(8) i64* @scc_B(double* readnone returned dereferenceable_or_null(8) "no-capture-maybe-returned" %a)
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;
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; FIXME: readnone missing for %s
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; CHECK: define dereferenceable_or_null(2) i8* @scc_C(i16* returned dereferenceable_or_null(2) "no-capture-maybe-returned" %a)
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;
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; float *scc_A(int *a) {
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; return (float*)(a ? (int*)scc_A((int*)scc_B((double*)scc_C((short*)a))) : a);
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; }
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;
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; long *scc_B(double *a) {
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; return (long*)(a ? scc_C((short*)scc_B((double*)scc_A((int*)a))) : a);
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; }
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;
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; void *scc_C(short *a) {
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; return scc_A((int*)(scc_A(a) ? scc_B((double*)a) : scc_C(a)));
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; }
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define float* @scc_A(i32* dereferenceable_or_null(4) %a) {
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entry:
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%tobool = icmp ne i32* %a, null
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br i1 %tobool, label %cond.true, label %cond.false
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cond.true: ; preds = %entry
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%0 = bitcast i32* %a to i16*
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%call = call i8* @scc_C(i16* %0)
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%1 = bitcast i8* %call to double*
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%call1 = call i64* @scc_B(double* %1)
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%2 = bitcast i64* %call1 to i32*
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%call2 = call float* @scc_A(i32* %2)
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%3 = bitcast float* %call2 to i32*
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br label %cond.end
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cond.false: ; preds = %entry
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br label %cond.end
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cond.end: ; preds = %cond.false, %cond.true
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%cond = phi i32* [ %3, %cond.true ], [ %a, %cond.false ]
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%4 = bitcast i32* %cond to float*
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ret float* %4
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}
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define i64* @scc_B(double* dereferenceable_or_null(8) %a) {
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entry:
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%tobool = icmp ne double* %a, null
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br i1 %tobool, label %cond.true, label %cond.false
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cond.true: ; preds = %entry
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%0 = bitcast double* %a to i32*
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%call = call float* @scc_A(i32* %0)
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%1 = bitcast float* %call to double*
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%call1 = call i64* @scc_B(double* %1)
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%2 = bitcast i64* %call1 to i16*
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%call2 = call i8* @scc_C(i16* %2)
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br label %cond.end
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cond.false: ; preds = %entry
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%3 = bitcast double* %a to i8*
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br label %cond.end
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cond.end: ; preds = %cond.false, %cond.true
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%cond = phi i8* [ %call2, %cond.true ], [ %3, %cond.false ]
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%4 = bitcast i8* %cond to i64*
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ret i64* %4
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}
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define i8* @scc_C(i16* dereferenceable_or_null(2) %a) {
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entry:
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%bc = bitcast i16* %a to i32*
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%call = call float* @scc_A(i32* %bc)
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%bc2 = bitcast float* %call to i8*
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%tobool = icmp ne i8* %bc2, null
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br i1 %tobool, label %cond.true, label %cond.false
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cond.true: ; preds = %entry
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%0 = bitcast i16* %a to double*
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%call1 = call i64* @scc_B(double* %0)
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%1 = bitcast i64* %call1 to i8*
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br label %cond.end
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cond.false: ; preds = %entry
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%call2 = call i8* @scc_C(i16* %a)
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br label %cond.end
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cond.end: ; preds = %cond.false, %cond.true
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%cond = phi i8* [ %1, %cond.true ], [ %call2, %cond.false ]
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%2 = bitcast i8* %cond to i32*
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%call3 = call float* @scc_A(i32* %2)
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%3 = bitcast float* %call3 to i8*
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ret i8* %3
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}
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; TEST call to external function, marked no-capture
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;
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; void external_no_capture(int /* no-capture */ *p);
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; void test_external_no_capture(int *p) {
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; external_no_capture(p);
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; }
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;
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; CHECK: define void @test_external_no_capture(i32* nocapture %p)
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declare void @external_no_capture(i32* nocapture)
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define void @test_external_no_capture(i32* %p) #0 {
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entry:
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call void @external_no_capture(i32* %p)
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ret void
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}
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; TEST call to external var-args function, marked no-capture
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;
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; void test_var_arg_call(char *p, int a) {
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; printf(p, a);
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; }
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;
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; CHECK: define void @test_var_arg_call(i8* nocapture %p, i32 %a)
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define void @test_var_arg_call(i8* %p, i32 %a) #0 {
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entry:
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%call = call i32 (i8*, ...) @printf(i8* %p, i32 %a)
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ret void
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}
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declare i32 @printf(i8* nocapture, ...)
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; TEST "captured" only through return
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;
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; long *not_captured_but_returned_0(long *a) {
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; *a1 = 0;
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; return a;
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; }
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;
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; There should *not* be a no-capture attribute on %a
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; CHECK: define i64* @not_captured_but_returned_0(i64* returned "no-capture-maybe-returned" %a)
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define i64* @not_captured_but_returned_0(i64* %a) #0 {
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entry:
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store i64 0, i64* %a, align 8
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ret i64* %a
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}
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; TEST "captured" only through return
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;
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; long *not_captured_but_returned_1(long *a) {
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; *(a+1) = 1;
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; return a + 1;
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; }
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;
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; There should *not* be a no-capture attribute on %a
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; CHECK: define nonnull i64* @not_captured_but_returned_1(i64* "no-capture-maybe-returned" %a)
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define i64* @not_captured_but_returned_1(i64* %a) #0 {
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entry:
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%add.ptr = getelementptr inbounds i64, i64* %a, i64 1
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store i64 1, i64* %add.ptr, align 8
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ret i64* %add.ptr
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}
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; TEST calls to "captured" only through return functions
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;
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; void test_not_captured_but_returned_calls(long *a) {
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; not_captured_but_returned_0(a);
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; not_captured_but_returned_1(a);
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; }
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;
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; FIXME: no-capture missing for %a
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; CHECK: define void @test_not_captured_but_returned_calls(i64* nocapture %a)
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define void @test_not_captured_but_returned_calls(i64* %a) #0 {
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entry:
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%call = call i64* @not_captured_but_returned_0(i64* %a)
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%call1 = call i64* @not_captured_but_returned_1(i64* %a)
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ret void
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}
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; TEST "captured" only through transitive return
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;
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; long* negative_test_not_captured_but_returned_call_0a(long *a) {
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; return not_captured_but_returned_0(a);
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; }
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;
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; There should *not* be a no-capture attribute on %a
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; CHECK: define i64* @negative_test_not_captured_but_returned_call_0a(i64* returned "no-capture-maybe-returned" %a)
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define i64* @negative_test_not_captured_but_returned_call_0a(i64* %a) #0 {
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entry:
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%call = call i64* @not_captured_but_returned_0(i64* %a)
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ret i64* %call
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}
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; TEST captured through write
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;
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; void negative_test_not_captured_but_returned_call_0b(long *a) {
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; *a = (long)not_captured_but_returned_0(a);
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; }
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;
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; There should *not* be a no-capture attribute on %a
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; CHECK: define void @negative_test_not_captured_but_returned_call_0b(i64* %a)
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define void @negative_test_not_captured_but_returned_call_0b(i64* %a) #0 {
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entry:
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%call = call i64* @not_captured_but_returned_0(i64* %a)
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%0 = ptrtoint i64* %call to i64
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store i64 %0, i64* %a, align 8
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ret void
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}
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; TEST "captured" only through transitive return
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;
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; long* negative_test_not_captured_but_returned_call_1a(long *a) {
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; return not_captured_but_returned_1(a);
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; }
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;
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; There should *not* be a no-capture attribute on %a
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; CHECK: define nonnull i64* @negative_test_not_captured_but_returned_call_1a(i64* "no-capture-maybe-returned" %a)
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define i64* @negative_test_not_captured_but_returned_call_1a(i64* %a) #0 {
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entry:
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%call = call i64* @not_captured_but_returned_1(i64* %a)
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ret i64* %call
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}
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; TEST captured through write
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;
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; void negative_test_not_captured_but_returned_call_1b(long *a) {
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; *a = (long)not_captured_but_returned_1(a);
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; }
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;
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; There should *not* be a no-capture attribute on %a
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; CHECK: define void @negative_test_not_captured_but_returned_call_1b(i64* %a)
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define void @negative_test_not_captured_but_returned_call_1b(i64* %a) #0 {
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entry:
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%call = call i64* @not_captured_but_returned_1(i64* %a)
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%0 = ptrtoint i64* %call to i64
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store i64 %0, i64* %call, align 8
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ret void
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}
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; TEST return argument or unknown call result
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;
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; int* ret_arg_or_unknown(int* b) {
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; if (b == 0)
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; return b;
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; return unknown();
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; }
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;
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; Verify we do *not* assume b is returned or not captured.
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;
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; CHECK: define i32* @ret_arg_or_unknown(i32* readnone %b)
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; CHECK: define i32* @ret_arg_or_unknown_through_phi(i32* readnone %b)
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declare i32* @unknown()
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define i32* @ret_arg_or_unknown(i32* %b) #0 {
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entry:
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%cmp = icmp eq i32* %b, null
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br i1 %cmp, label %ret_arg, label %ret_unknown
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ret_arg:
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ret i32* %b
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ret_unknown:
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%call = call i32* @unknown()
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ret i32* %call
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}
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define i32* @ret_arg_or_unknown_through_phi(i32* %b) #0 {
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entry:
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%cmp = icmp eq i32* %b, null
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br i1 %cmp, label %ret_arg, label %ret_unknown
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ret_arg:
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br label %r
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ret_unknown:
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%call = call i32* @unknown()
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br label %r
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r:
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%phi = phi i32* [ %b, %ret_arg ], [ %call, %ret_unknown ]
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ret i32* %phi
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}
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; TEST not captured by readonly external function
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;
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; CHECK: define void @not_captured_by_readonly_call(i32* nocapture %b)
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declare i32* @readonly_unknown(i32*, i32*) readonly
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define void @not_captured_by_readonly_call(i32* %b) #0 {
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entry:
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%call = call i32* @readonly_unknown(i32* %b, i32* %b)
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ret void
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}
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; TEST not captured by readonly external function if return chain is known
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;
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; Make sure the returned flag on %r is strong enough to justify nocapture on %b but **not** on %r.
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;
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; FIXME: The "returned" information is not propagated to the fullest extend causing us to miss "nocapture" on %b in the following:
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; CHECK: define i32* @not_captured_by_readonly_call_not_returned_either1(i32* readonly %b, i32* readonly returned %r)
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;
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; CHECK: define i32* @not_captured_by_readonly_call_not_returned_either2(i32* readonly %b, i32* readonly returned %r)
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; CHECK: define i32* @not_captured_by_readonly_call_not_returned_either3(i32* readonly %b, i32* readonly returned %r)
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;
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; FIXME: The "nounwind" information is not derived to the fullest extend causing us to miss "nocapture" on %b in the following:
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; CHECK: define i32* @not_captured_by_readonly_call_not_returned_either4(i32* readonly %b, i32* readonly returned %r)
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define i32* @not_captured_by_readonly_call_not_returned_either1(i32* %b, i32* returned %r) #0 {
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entry:
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%call = call i32* @readonly_unknown(i32* %b, i32* %r) nounwind
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ret i32* %call
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}
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declare i32* @readonly_unknown_r1a(i32*, i32* returned) readonly
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define i32* @not_captured_by_readonly_call_not_returned_either2(i32* %b, i32* %r) #0 {
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entry:
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%call = call i32* @readonly_unknown_r1a(i32* %b, i32* %r) nounwind
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ret i32* %call
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}
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declare i32* @readonly_unknown_r1b(i32*, i32* returned) readonly nounwind
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define i32* @not_captured_by_readonly_call_not_returned_either3(i32* %b, i32* %r) #0 {
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entry:
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%call = call i32* @readonly_unknown_r1b(i32* %b, i32* %r)
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|
ret i32* %call
|
|
}
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define i32* @not_captured_by_readonly_call_not_returned_either4(i32* %b, i32* %r) #0 {
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|
entry:
|
|
%call = call i32* @readonly_unknown_r1a(i32* %b, i32* %r)
|
|
ret i32* %call
|
|
}
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|
|
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attributes #0 = { noinline nounwind uwtable }
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