forked from OSchip/llvm-project
AMDGPU: mark ldexp LibCalls as unavailable
Summary: The LibCallSimplifier will turn llvm.exp2.* intrinsics into ldexp* libcalls which do not make sense with the AMDGPU backend. In the long run, we'll want an llvm.ldexp.* intrinsic to properly make use of this optimization, but this works around the problem for now. See also: http://reviews.llvm.org/D14327 (suggested llvm.ldexp.* implementation) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92709 Reviewers: arsenm, tstellarAMD Differential Revision: http://reviews.llvm.org/D14990 llvm-svn: 255658
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8f307217c3
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78fd4f087b
llvm
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@ -61,6 +61,13 @@ static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
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}
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#endif // !NDEBUG
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if (T.getArch() == Triple::r600 ||
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T.getArch() == Triple::amdgcn) {
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TLI.setUnavailable(LibFunc::ldexp);
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TLI.setUnavailable(LibFunc::ldexpf);
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TLI.setUnavailable(LibFunc::ldexpl);
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}
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// There are no library implementations of mempcy and memset for AMD gpus and
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// these can be difficult to lower in the backend.
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if (T.getArch() == Triple::r600 ||
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@ -1,7 +1,8 @@
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; Test that the exp2 library call simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; RUN: opt < %s -instcombine -S -mtriple=i386-pc-win32 | FileCheck %s -check-prefix=CHECK-WIN
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; RUN: opt < %s -instcombine -S | FileCheck %s -check-prefix=CHECK -check-prefix=INTRINSIC -check-prefix=LDEXP -check-prefix=LDEXPF
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; RUN: opt < %s -instcombine -S -mtriple=i386-pc-win32 | FileCheck %s -check-prefix=INTRINSIC -check-prefix=LDEXP -check-prefix=NOLDEXPF
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; RUN: opt < %s -instcombine -S -mtriple=amdgcn-unknown-unknown | FileCheck %s -check-prefix=INTRINSIC -check-prefix=NOLDEXP -check-prefix=NOLDEXPF
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@ -80,21 +81,19 @@ declare double @llvm.exp2.f64(double)
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declare float @llvm.exp2.f32(float)
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define double @test_simplify9(i8 zeroext %x) {
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; CHECK-LABEL: @test_simplify9(
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; CHECK-WIN-LABEL: @test_simplify9(
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; INTRINSIC-LABEL: @test_simplify9(
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%conv = uitofp i8 %x to double
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%ret = call double @llvm.exp2.f64(double %conv)
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; CHECK: call double @ldexp
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; CHECK-WIN: call double @ldexp
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; LDEXP: call double @ldexp
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; NOLDEXP-NOT: call double @ldexp
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ret double %ret
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}
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define float @test_simplify10(i8 zeroext %x) {
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; CHECK-LABEL: @test_simplify10(
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; CHECK-WIN-LABEL: @test_simplify10(
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; INTRINSIC-LABEL: @test_simplify10(
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%conv = uitofp i8 %x to float
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%ret = call float @llvm.exp2.f32(float %conv)
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; CHECK: call float @ldexpf
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; CHECK-WIN-NOT: call float @ldexpf
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; LDEXPF: call float @ldexpf
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; NOLDEXPF-NOT: call float @ldexpf
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ret float %ret
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}
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