derek.holloway
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63 lines
2.3 KiB
LLVM
63 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=amdgcn < %s | FileCheck %s --check-prefixes=CHECK,SIGNED-ZEROS
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; RUN: llc -mtriple=amdgcn --enable-no-signed-zeros-fp-math < %s | FileCheck %s --check-prefixes=CHECK,NO-SIGNED-ZEROS
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; Test folding of float->int->float roundtrips into float-only operations.
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define float @test_signed_basic(float %x) {
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; SIGNED-ZEROS-LABEL: test_signed_basic:
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; SIGNED-ZEROS: ; %bb.0: ; %entry
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; SIGNED-ZEROS-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; SIGNED-ZEROS-NEXT: v_cvt_i32_f32_e32 v0, v0
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; SIGNED-ZEROS-NEXT: v_cvt_f32_i32_e32 v0, v0
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; SIGNED-ZEROS-NEXT: s_setpc_b64 s[30:31]
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;
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; NO-SIGNED-ZEROS-LABEL: test_signed_basic:
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; NO-SIGNED-ZEROS: ; %bb.0: ; %entry
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; NO-SIGNED-ZEROS-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; NO-SIGNED-ZEROS-NEXT: v_trunc_f32_e32 v0, v0
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; NO-SIGNED-ZEROS-NEXT: s_setpc_b64 s[30:31]
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entry:
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%i = fptosi float %x to i32
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%f = sitofp i32 %i to float
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ret float %f
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}
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; For unsigned conversions, even when signed zeros are possible, we can still
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; use truncate because fabs is free.
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define float @test_unsigned_basic(float %x) {
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; SIGNED-ZEROS-LABEL: test_unsigned_basic:
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; SIGNED-ZEROS: ; %bb.0: ; %entry
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; SIGNED-ZEROS-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; SIGNED-ZEROS-NEXT: v_trunc_f32_e64 v0, |v0|
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; SIGNED-ZEROS-NEXT: s_setpc_b64 s[30:31]
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;
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; NO-SIGNED-ZEROS-LABEL: test_unsigned_basic:
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; NO-SIGNED-ZEROS: ; %bb.0: ; %entry
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; NO-SIGNED-ZEROS-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; NO-SIGNED-ZEROS-NEXT: v_trunc_f32_e32 v0, v0
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; NO-SIGNED-ZEROS-NEXT: s_setpc_b64 s[30:31]
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entry:
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%i = fptoui float %x to i32
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%f = uitofp i32 %i to float
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ret float %f
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}
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; 16777217 is NOT exactly representable in f32.
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define float @test_inexact_16777217(float %x) {
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; CHECK-LABEL: test_inexact_16777217:
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; CHECK: ; %bb.0: ; %entry
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: v_cvt_i32_f32_e32 v0, v0
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; CHECK-NEXT: v_min_i32_e32 v0, 0x1000001, v0
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; CHECK-NEXT: v_cvt_f32_i32_e32 v0, v0
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; CHECK-NEXT: s_setpc_b64 s[30:31]
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entry:
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%i = fptosi float %x to i32
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%clamped = call i32 @llvm.smin.i32(i32 %i, i32 16777217)
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%f = sitofp i32 %clamped to float
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ret float %f
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}
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declare i32 @llvm.smin.i32(i32, i32)
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