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b7d4502f35
Use mask and negate for legalization of i1 source type with SIGN_EXTEND_INREG. With the mask, this should be no worse than 2 shifts. The mask can be eliminated in some cases, so that should be better than 2 shifts. This change exposed some missing folds related to negation: https://reviews.llvm.org/rL284239 https://reviews.llvm.org/rL284395 There may be others, so please let me know if you see any regressions. Differential Revision: https://reviews.llvm.org/D25485 llvm-svn: 284611
26 lines
591 B
LLVM
26 lines
591 B
LLVM
; RUN: llc -verify-machineinstrs < %s -mtriple=powerpc64le-unknown-linux-gnu | FileCheck %s
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; PR30661 - https://llvm.org/bugs/show_bug.cgi?id=30661
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define i32 @select_i32_neg1_or_0(i1 %a) {
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; CHECK-LABEL: select_i32_neg1_or_0:
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; CHECK: # BB#0:
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; CHECK-NEXT: clrldi 3, 3, 63
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; CHECK-NEXT: neg 3, 3
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; CHECK-NEXT: blr
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;
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%b = sext i1 %a to i32
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ret i32 %b
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}
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define i32 @select_i32_neg1_or_0_zeroext(i1 zeroext %a) {
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; CHECK-LABEL: select_i32_neg1_or_0_zeroext:
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; CHECK: # BB#0:
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; CHECK-NEXT: neg 3, 3
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; CHECK-NEXT: blr
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;
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%b = sext i1 %a to i32
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ret i32 %b
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}
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