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ValueTracking: Look through canonicalize in isKnownNeverInfinity

This commit is contained in:
Matt Arsenault 2022-11-16 21:44:28 -08:00
parent 4fdf624b78
commit d24fe812ec
2 changed files with 31 additions and 0 deletions
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9
llvm/lib/Analysis/ValueTracking.cpp
View File

@ -3785,6 +3785,15 @@ bool llvm::isKnownNeverInfinity(const Value *V, const TargetLibraryInfo *TLI,
default:
break;
}
if (const auto *II = dyn_cast<IntrinsicInst>(V)) {
switch (II->getIntrinsicID()) {
case Intrinsic::canonicalize:
return isKnownNeverInfinity(Inst->getOperand(0), TLI, Depth + 1);
default:
break;
}
}
}
// try to handle fixed width vector constants

22
llvm/test/Transforms/InstSimplify/floating-point-compare.ll
View File

@ -185,6 +185,7 @@ declare <2 x float> @llvm.maxnum.v2f32(<2 x float>, <2 x float>)
declare float @llvm.maximum.f32(float, float)
declare double @llvm.exp2.f64(double)
declare float @llvm.fma.f32(float,float,float)
declare double @llvm.canonicalize.f64(double)
declare void @expect_equal(i1,i1)
@ -1261,3 +1262,24 @@ define i1 @isKnownNeverInfinity_fpext_sitofp(i16 %x) {
%r = fcmp oeq double %e, 0xfff0000000000000
ret i1 %r
}
define i1 @isKnownNeverInfinity_canonicalize(double %x) {
; CHECK-LABEL: @isKnownNeverInfinity_canonicalize(
; CHECK-NEXT: ret i1 true
;
%a = fadd ninf double %x, 1.0
%e = call double @llvm.canonicalize.f64(double %a)
%r = fcmp une double %e, 0x7ff0000000000000
ret i1 %r
}
define i1 @isNotKnownNeverInfinity_canonicalize(double %x) {
; CHECK-LABEL: @isNotKnownNeverInfinity_canonicalize(
; CHECK-NEXT: [[E:%.*]] = call double @llvm.canonicalize.f64(double [[X:%.*]])
; CHECK-NEXT: [[R:%.*]] = fcmp une double [[E]], 0x7FF0000000000000
; CHECK-NEXT: ret i1 [[R]]
;
%e = call double @llvm.canonicalize.f64(double %x)
%r = fcmp une double %e, 0x7ff0000000000000
ret i1 %r
}