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3f624d4650
This change was discussed in D15392. It allows us to remove the fold that was added in: http://reviews.llvm.org/r255261 ...and it will allow us to generalize this fold: http://reviews.llvm.org/rL112232 while preserving the order of bitcast + extract that it produces and testing shows is better handled by the backend. Note that the existing check for "isVectorTy()" wasn't strong enough in general and specifically because: x86_mmx. It's not a vector, but it's not vectorizable either. So here we check VectorType::isValidElementType() directly before proceeding with the transform. llvm-svn: 255433
42 lines
911 B
LLVM
42 lines
911 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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define double @a(<1 x i64> %y) {
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%c = bitcast <1 x i64> %y to double
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ret double %c
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; CHECK-LABEL: @a(
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; CHECK-NEXT: bitcast <1 x i64> %y to <1 x double>
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; CHECK-NEXT: extractelement <1 x double> {{.*}}, i32 0
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; CHECK-NEXT: ret double
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}
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define i64 @b(<1 x i64> %y) {
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%c = bitcast <1 x i64> %y to i64
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ret i64 %c
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; CHECK-LABEL: @b(
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; CHECK-NEXT: extractelement <1 x i64> %y, i32 0
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; CHECK-NEXT: ret i64
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}
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define <1 x i64> @c(double %y) {
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%c = bitcast double %y to <1 x i64>
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ret <1 x i64> %c
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; CHECK-LABEL: @c(
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; CHECK-NEXT: bitcast double %y to i64
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; CHECK-NEXT: insertelement <1 x i64> undef, i64 {{.*}}, i32 0
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; CHECK-NEXT: ret <1 x i64>
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}
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define <1 x i64> @d(i64 %y) {
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%c = bitcast i64 %y to <1 x i64>
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ret <1 x i64> %c
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; CHECK-LABEL: @d(
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; CHECK-NEXT: insertelement <1 x i64> undef, i64 %y, i32 0
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; CHECK-NEXT: ret <1 x i64>
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}
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