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c0d1ce55ac
Double and single rounding can produce different results. This is the IR counterpart to r228911. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238531 91177308-0d34-0410-b5e6-96231b3b80d8
96 lines
2.4 KiB
LLVM
96 lines
2.4 KiB
LLVM
; Test some floating point casting cases
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i8 @test1() {
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%x = fptoui float 2.550000e+02 to i8 ; <i8> [#uses=1]
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ret i8 %x
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; CHECK: ret i8 -1
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}
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define i8 @test2() {
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%x = fptosi float -1.000000e+00 to i8 ; <i8> [#uses=1]
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ret i8 %x
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; CHECK: ret i8 -1
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}
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; CHECK: test3
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define half @test3(float %a) {
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; CHECK: fptrunc
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; CHECK: llvm.fabs.f16
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%b = call float @llvm.fabs.f32(float %a)
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%c = fptrunc float %b to half
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ret half %c
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}
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; CHECK: test4
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define half @test4(float %a) {
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; CHECK: fptrunc
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; CHECK: fsub
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%b = fsub float -0.0, %a
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%c = fptrunc float %b to half
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ret half %c
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}
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; CHECK: test4-fast
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define half @test4-fast(float %a) {
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; CHECK: fptrunc
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; CHECK: fsub fast
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%b = fsub fast float -0.0, %a
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%c = fptrunc float %b to half
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ret half %c
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}
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; CHECK: test5
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define half @test5(float %a, float %b, float %c) {
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; CHECK: fcmp ogt
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; CHECK: fptrunc
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; CHECK: select
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; CHECK: half 0xH3C00
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%d = fcmp ogt float %a, %b
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%e = select i1 %d, float %c, float 1.0
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%f = fptrunc float %e to half
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ret half %f
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}
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declare float @llvm.fabs.f32(float) nounwind readonly
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define <1 x float> @test6(<1 x double> %V) {
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%frem = frem <1 x double> %V, %V
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%trunc = fptrunc <1 x double> %frem to <1 x float>
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ret <1 x float> %trunc
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; CHECK-LABEL: @test6
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; CHECK-NEXT: %[[frem:.*]] = frem <1 x double> %V, %V
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; CHECK-NEXT: %[[trunc:.*]] = fptrunc <1 x double> %[[frem]] to <1 x float>
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; CHECK-NEXT: ret <1 x float> %trunc
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}
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define float @test7(double %V) {
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%frem = frem double %V, 1.000000e+00
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%trunc = fptrunc double %frem to float
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ret float %trunc
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; CHECK-LABEL: @test7
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; CHECK-NEXT: %[[frem:.*]] = frem double %V, 1.000000e+00
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; CHECK-NEXT: %[[trunc:.*]] = fptrunc double %frem to float
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; CHECK-NEXT: ret float %trunc
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}
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define float @test8(float %V) {
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%fext = fpext float %V to double
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%frem = frem double %fext, 1.000000e-01
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%trunc = fptrunc double %frem to float
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ret float %trunc
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; CHECK-LABEL: @test8
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; CHECK-NEXT: %[[fext:.*]] = fpext float %V to double
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; CHECK-NEXT: %[[frem:.*]] = frem double %fext, 1.000000e-01
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; CHECK-NEXT: %[[trunc:.*]] = fptrunc double %frem to float
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; CHECK-NEXT: ret float %trunc
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}
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; CHECK-LABEL: @test_fptrunc_fptrunc
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; CHECK-NOT: fptrunc double {{.*}} to half
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define half @test_fptrunc_fptrunc(double %V) {
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%t1 = fptrunc double %V to float
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%t2 = fptrunc float %t1 to half
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ret half %t2
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}
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