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250efba0f3
This improves the X86 cost model for small constants with large types. Before this commit we would even hoist trivial constants such as i96 2. This is related to <rdar://problem/17070936> llvm-svn: 210504
37 lines
1006 B
LLVM
37 lines
1006 B
LLVM
; RUN: opt -mtriple=x86_64-darwin-unknown -S -consthoist < %s | FileCheck %s
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define i128 @test1(i128 %a) nounwind {
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; CHECK-LABEL: test1
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; CHECK: %const = bitcast i128 12297829382473034410122878 to i128
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%1 = add i128 %a, 12297829382473034410122878
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%2 = add i128 %1, 12297829382473034410122878
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ret i128 %2
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}
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; Check that we don't hoist the shift value of a shift instruction.
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define i512 @test2(i512 %a) nounwind {
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; CHECK-LABEL: test2
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; CHECK-NOT: %const = bitcast i512 504 to i512
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%1 = shl i512 %a, 504
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%2 = ashr i512 %1, 504
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ret i512 %2
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}
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; Check that we don't hoist constants with a type larger than i128.
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define i196 @test3(i196 %a) nounwind {
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; CHECK-LABEL: test3
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; CHECK-NOT: %const = bitcast i196 2 to i196
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%1 = mul i196 %a, 2
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%2 = mul i196 %1, 2
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ret i196 %2
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}
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; Check that we don't hoist immediates with small values.
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define i96 @test4(i96 %a) nounwind {
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; CHECK-LABEL: test4
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; CHECK-NOT: %const = bitcast i96 2 to i96
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%1 = mul i96 %a, 2
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%2 = add i96 %1, 2
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ret i96 %2
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}
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