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| author | Pete Cooper <peter_cooper@apple.com> | 2012-07-26 22:37:04 +0000 |
|---|---|---|
| committer | Pete Cooper <peter_cooper@apple.com> | 2012-07-26 22:37:04 +0000 |
| commit | 1121c786fc24a4a8ce6c778cb9b5acdfa9006ffb (patch) | |
| tree | f3441bbcbcb0ebc8c0afcaa7ccea734e26b98433 | |
| parent | 79ad138a3341f2ac8121208db6559438b13b5a69 (diff) | |
Teach SimplifyDemandedBits how to look through fpext and fptrunc to simplify their operand
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160823 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp | 6 | ||||
| -rw-r--r-- | test/Transforms/InstCombine/vec_demanded_elts.ll | 28 |
2 files changed, 34 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp index 125c74a89a..46ba83b651 100644 --- a/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp +++ b/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp @@ -1074,6 +1074,12 @@ Value *InstCombiner::SimplifyDemandedVectorElts(Value *V, APInt DemandedElts, // like undef&0. The result is known zero, not undef. UndefElts &= UndefElts2; break; + case Instruction::FPTrunc: + case Instruction::FPExt: + TmpV = SimplifyDemandedVectorElts(I->getOperand(0), DemandedElts, + UndefElts, Depth+1); + if (TmpV) { I->setOperand(0, TmpV); MadeChange = true; } + break; case Instruction::Call: { IntrinsicInst *II = dyn_cast<IntrinsicInst>(I); diff --git a/test/Transforms/InstCombine/vec_demanded_elts.ll b/test/Transforms/InstCombine/vec_demanded_elts.ll index cc63371ede..d904196d13 100644 --- a/test/Transforms/InstCombine/vec_demanded_elts.ll +++ b/test/Transforms/InstCombine/vec_demanded_elts.ll @@ -162,4 +162,32 @@ entry: ret <4 x float> %shuffle9.i } +define <2 x float> @test_fptrunc(double %f) { +; CHECK: @test_fptrunc +; CHECK: insertelement +; CHECK: insertelement +; CHECK-NOT: insertelement + %tmp9 = insertelement <4 x double> undef, double %f, i32 0 + %tmp10 = insertelement <4 x double> %tmp9, double 0.000000e+00, i32 1 + %tmp11 = insertelement <4 x double> %tmp10, double 0.000000e+00, i32 2 + %tmp12 = insertelement <4 x double> %tmp11, double 0.000000e+00, i32 3 + %tmp5 = fptrunc <4 x double> %tmp12 to <4 x float> + %ret = shufflevector <4 x float> %tmp5, <4 x float> undef, <2 x i32> <i32 0, i32 1> + ret <2 x float> %ret +} + +define <2 x double> @test_fpext(float %f) { +; CHECK: @test_fpext +; CHECK: insertelement +; CHECK: insertelement +; CHECK-NOT: insertelement + %tmp9 = insertelement <4 x float> undef, float %f, i32 0 + %tmp10 = insertelement <4 x float> %tmp9, float 0.000000e+00, i32 1 + %tmp11 = insertelement <4 x float> %tmp10, float 0.000000e+00, i32 2 + %tmp12 = insertelement <4 x float> %tmp11, float 0.000000e+00, i32 3 + %tmp5 = fpext <4 x float> %tmp12 to <4 x double> + %ret = shufflevector <4 x double> %tmp5, <4 x double> undef, <2 x i32> <i32 0, i32 1> + ret <2 x double> %ret +} + |