forked from OSchip/llvm-project
103 lines
3.9 KiB
LLVM
103 lines
3.9 KiB
LLVM
; RUN: opt -O3 -S < %s | FileCheck %s
|
|
|
|
; Test to verify that constants aren't folded when the rounding mode is unknown.
|
|
; CHECK-LABEL: @f1
|
|
; CHECK: call double @llvm.experimental.constrained.fdiv.f64
|
|
define double @f1() {
|
|
entry:
|
|
%div = call double @llvm.experimental.constrained.fdiv.f64(
|
|
double 1.000000e+00,
|
|
double 1.000000e+01,
|
|
metadata !"round.dynamic",
|
|
metadata !"fpexcept.strict")
|
|
ret double %div
|
|
}
|
|
|
|
; Verify that 'a - 0' isn't simplified to 'a' when the rounding mode is unknown.
|
|
;
|
|
; double f2(double a) {
|
|
; // Because the result of '0 - 0' is negative zero if rounding mode is
|
|
; // downward, this shouldn't be simplified.
|
|
; return a - 0.0;
|
|
; }
|
|
;
|
|
; CHECK-LABEL: @f2
|
|
; CHECK: call double @llvm.experimental.constrained.fsub.f64
|
|
define double @f2(double %a) {
|
|
entry:
|
|
%div = call double @llvm.experimental.constrained.fsub.f64(
|
|
double %a, double 0.000000e+00,
|
|
metadata !"round.dynamic",
|
|
metadata !"fpexcept.strict")
|
|
ret double %div
|
|
}
|
|
|
|
; Verify that '-((-a)*b)' isn't simplified to 'a*b' when the rounding mode is
|
|
; unknown.
|
|
;
|
|
; double f3(double a, double b) {
|
|
; // Because the intermediate value involved in this calculation may require
|
|
; // rounding, this shouldn't be simplified.
|
|
; return -((-a)*b);
|
|
; }
|
|
;
|
|
; CHECK-LABEL: @f3
|
|
; CHECK: call double @llvm.experimental.constrained.fsub.f64
|
|
; CHECK: call double @llvm.experimental.constrained.fmul.f64
|
|
; CHECK: call double @llvm.experimental.constrained.fsub.f64
|
|
define double @f3(double %a, double %b) {
|
|
entry:
|
|
%sub = call double @llvm.experimental.constrained.fsub.f64(
|
|
double -0.000000e+00, double %a,
|
|
metadata !"round.dynamic",
|
|
metadata !"fpexcept.strict")
|
|
%mul = call double @llvm.experimental.constrained.fmul.f64(
|
|
double %sub, double %b,
|
|
metadata !"round.dynamic",
|
|
metadata !"fpexcept.strict")
|
|
%ret = call double @llvm.experimental.constrained.fsub.f64(
|
|
double -0.000000e+00,
|
|
double %mul,
|
|
metadata !"round.dynamic",
|
|
metadata !"fpexcept.strict")
|
|
ret double %ret
|
|
}
|
|
|
|
; Verify that FP operations are not performed speculatively when FP exceptions
|
|
; are not being ignored.
|
|
;
|
|
; double f4(int n, double a) {
|
|
; // Because a + 1 may overflow, this should not be simplified.
|
|
; if (n > 0)
|
|
; return a + 1.0;
|
|
; return a;
|
|
; }
|
|
;
|
|
;
|
|
; CHECK-LABEL: @f4
|
|
; CHECK-NOT: select
|
|
; CHECK: br i1 %cmp
|
|
define double @f4(i32 %n, double %a) {
|
|
entry:
|
|
%cmp = icmp sgt i32 %n, 0
|
|
br i1 %cmp, label %if.then, label %if.end
|
|
|
|
if.then:
|
|
%add = call double @llvm.experimental.constrained.fadd.f64(
|
|
double 1.000000e+00, double %a,
|
|
metadata !"round.dynamic",
|
|
metadata !"fpexcept.strict")
|
|
br label %if.end
|
|
|
|
if.end:
|
|
%a.0 = phi double [%add, %if.then], [ %a, %entry ]
|
|
ret double %a.0
|
|
}
|
|
|
|
|
|
@llvm.fp.env = thread_local global i8 zeroinitializer, section "llvm.metadata"
|
|
declare double @llvm.experimental.constrained.fdiv.f64(double, double, metadata, metadata)
|
|
declare double @llvm.experimental.constrained.fmul.f64(double, double, metadata, metadata)
|
|
declare double @llvm.experimental.constrained.fadd.f64(double, double, metadata, metadata)
|
|
declare double @llvm.experimental.constrained.fsub.f64(double, double, metadata, metadata)
|