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b814633873
Summary: Previously there were three ways to inform the NVVMReflect pass whether you wanted to flush denormals to zero: * An LLVM command-line option * Parameters to the NVVMReflect constructor * Metadata on the module itself. This change removes the first two, leaving only the third. The motivation for this change, aside from simplifying things, is that we want LLVM to be aware of whether it's operating in FTZ mode, so other passes can use this information. Ideally we'd have a target-generic piece of metadata on the module. This change moves us in that direction. Reviewers: tra Subscribers: jholewinski, llvm-commits Differential Revision: https://reviews.llvm.org/D28700 llvm-svn: 292068
87 lines
2.8 KiB
LLVM
87 lines
2.8 KiB
LLVM
; We run nvvm-reflect (and then optimize) this module twice, once with metadata
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; that enables FTZ, and again with metadata that disables it.
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; RUN: cat %s > %t.noftz
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; RUN: echo '!0 = !{i32 4, !"nvvm-reflect-ftz", i32 0}' >> %t.noftz
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; RUN: opt %t.noftz -S -nvvm-reflect -O2 \
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; RUN: | FileCheck %s --check-prefix=USE_FTZ_0 --check-prefix=CHECK
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; RUN: cat %s > %t.ftz
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; RUN: echo '!0 = !{i32 4, !"nvvm-reflect-ftz", i32 1}' >> %t.ftz
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; RUN: opt %t.ftz -S -nvvm-reflect -O2 \
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; RUN: | FileCheck %s --check-prefix=USE_FTZ_1 --check-prefix=CHECK
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@str = private unnamed_addr addrspace(4) constant [11 x i8] c"__CUDA_FTZ\00"
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declare i32 @__nvvm_reflect(i8*)
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declare i8* @llvm.nvvm.ptr.constant.to.gen.p0i8.p4i8(i8 addrspace(4)*)
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; CHECK-LABEL: @foo
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define float @foo(float %a, float %b) {
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; CHECK-NOT: call i32 @__nvvm_reflect
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%ptr = tail call i8* @llvm.nvvm.ptr.constant.to.gen.p0i8.p4i8(i8 addrspace(4)* getelementptr inbounds ([11 x i8], [11 x i8] addrspace(4)* @str, i32 0, i32 0))
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%reflect = tail call i32 @__nvvm_reflect(i8* %ptr)
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%cmp = icmp ugt i32 %reflect, 0
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br i1 %cmp, label %use_mul, label %use_add
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use_mul:
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; USE_FTZ_1: fmul float %a, %b
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; USE_FTZ_0-NOT: fadd float %a, %b
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%ret1 = fmul float %a, %b
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br label %exit
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use_add:
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; USE_FTZ_0: fadd float %a, %b
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; USE_FTZ_1-NOT: fmul float %a, %b
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%ret2 = fadd float %a, %b
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br label %exit
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exit:
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%ret = phi float [%ret1, %use_mul], [%ret2, %use_add]
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ret float %ret
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}
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declare i32 @llvm.nvvm.reflect.p0i8(i8*)
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; CHECK-LABEL: define i32 @intrinsic
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define i32 @intrinsic() {
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; CHECK-NOT: call i32 @llvm.nvvm.reflect
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; USE_FTZ_0: ret i32 0
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; USE_FTZ_1: ret i32 1
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%ptr = tail call i8* @llvm.nvvm.ptr.constant.to.gen.p0i8.p4i8(i8 addrspace(4)* getelementptr inbounds ([11 x i8], [11 x i8] addrspace(4)* @str, i32 0, i32 0))
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%reflect = tail call i32 @llvm.nvvm.reflect.p0i8(i8* %ptr)
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ret i32 %reflect
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}
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; CUDA-7.0 passes __nvvm_reflect argument slightly differently.
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; Verify that it works, too
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@"$str" = private addrspace(1) constant [11 x i8] c"__CUDA_FTZ\00"
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; CHECK-LABEL: @bar
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define float @bar(float %a, float %b) {
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; CHECK-NOT: call i32 @__nvvm_reflect
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%reflect = call i32 @__nvvm_reflect(i8* addrspacecast (i8 addrspace(1)* getelementptr inbounds ([11 x i8], [11 x i8] addrspace(1)* @"$str", i32 0, i32 0) to i8*))
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%cmp = icmp ne i32 %reflect, 0
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br i1 %cmp, label %use_mul, label %use_add
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use_mul:
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; USE_FTZ_1: fmul float %a, %b
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; USE_FTZ_0-NOT: fadd float %a, %b
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%ret1 = fmul float %a, %b
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br label %exit
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use_add:
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; USE_FTZ_0: fadd float %a, %b
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; USE_FTZ_1-NOT: fmul float %a, %b
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%ret2 = fadd float %a, %b
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br label %exit
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exit:
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%ret = phi float [%ret1, %use_mul], [%ret2, %use_add]
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ret float %ret
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}
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!llvm.module.flags = !{!0}
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; A module flag is added to the end of this file by the RUN lines at the top.
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