forked from OSchip/llvm-project
77 lines
3.1 KiB
LLVM
77 lines
3.1 KiB
LLVM
; RUN: llc < %s -march=x86-64 -asm-verbose=false | FileCheck %s
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; LSR's OptimizeMax should eliminate the select (max).
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; CHECK: foo:
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; CHECK-NOT: cmov
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; CHECK: jle
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define void @foo(i64 %n, double* nocapture %p) nounwind {
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entry:
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%cmp6 = icmp slt i64 %n, 0 ; <i1> [#uses=1]
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br i1 %cmp6, label %for.end, label %for.body.preheader
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for.body.preheader: ; preds = %entry
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%tmp = icmp sgt i64 %n, 0 ; <i1> [#uses=1]
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%n.op = add i64 %n, 1 ; <i64> [#uses=1]
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%tmp1 = select i1 %tmp, i64 %n.op, i64 1 ; <i64> [#uses=1]
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br label %for.body
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for.body: ; preds = %for.body.preheader, %for.body
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%i = phi i64 [ %i.next, %for.body ], [ 0, %for.body.preheader ] ; <i64> [#uses=2]
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%arrayidx = getelementptr double* %p, i64 %i ; <double*> [#uses=2]
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%t4 = load double* %arrayidx ; <double> [#uses=1]
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%mul = fmul double %t4, 2.200000e+00 ; <double> [#uses=1]
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store double %mul, double* %arrayidx
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%i.next = add nsw i64 %i, 1 ; <i64> [#uses=2]
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%exitcond = icmp eq i64 %i.next, %tmp1 ; <i1> [#uses=1]
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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ret void
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}
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; In this case, one of the max operands is another max, which folds,
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; leaving a two-operand max which doesn't fit the usual pattern.
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; OptimizeMax should handle this case.
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; PR7454
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; CHECK: _Z18GenerateStatusPagei:
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; CHECK: jle
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; CHECK-NOT: cmov
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; CHECK: xorl %edi, %edi
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; CHECK-NEXT: align
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; CHECK-NEXT: BB1_2:
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; CHECK-NEXT: callq
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; CHECK-NEXT: incl %ebx
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; CHECK-NEXT: cmpl %r14d, %ebx
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; CHECK-NEXT: movq %rax, %rdi
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; CHECK-NEXT: jl
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define void @_Z18GenerateStatusPagei(i32 %jobs_to_display) nounwind {
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entry:
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%cmp.i = icmp sgt i32 %jobs_to_display, 0 ; <i1> [#uses=1]
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%tmp = select i1 %cmp.i, i32 %jobs_to_display, i32 0 ; <i32> [#uses=3]
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%cmp8 = icmp sgt i32 %tmp, 0 ; <i1> [#uses=1]
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br i1 %cmp8, label %bb.nph, label %for.end
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bb.nph: ; preds = %entry
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%tmp11 = icmp sgt i32 %tmp, 1 ; <i1> [#uses=1]
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%smax = select i1 %tmp11, i32 %tmp, i32 1 ; <i32> [#uses=1]
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br label %for.body
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for.body: ; preds = %for.body, %bb.nph
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%i.010 = phi i32 [ 0, %bb.nph ], [ %inc, %for.body ] ; <i32> [#uses=1]
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%it.0.09 = phi float* [ null, %bb.nph ], [ %call.i, %for.body ] ; <float*> [#uses=1]
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%call.i = call float* @_ZSt18_Rb_tree_decrementPKSt18_Rb_tree_node_base(float* %it.0.09) ; <float*> [#uses=1]
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%inc = add nsw i32 %i.010, 1 ; <i32> [#uses=2]
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%exitcond = icmp eq i32 %inc, %smax ; <i1> [#uses=1]
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body, %entry
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ret void
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}
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declare float* @_ZSt18_Rb_tree_decrementPKSt18_Rb_tree_node_base(float*)
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