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3cd755e246
Summary: This is a simple fix for CodeGenPrepare that freezes branch condition when transforming select to branch. If it is not frozen, instsimplify or the later pipeline can potentially exploit undefined behavior. The diff shows optimized form becase D75859 and D76048 already made a few changes to CodeGenPrepare for optimizing freeze(cmp). Reviewers: jdoerfert, spatel, lebedev.ri, efriedma Reviewed By: lebedev.ri Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D76179
17 lines
385 B
LLVM
17 lines
385 B
LLVM
; RUN: llc < %s -mtriple=thumbv7-apple-ios | FileCheck %s
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; rdar://12201387
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;CHECK-LABEL: select_s_v_v:
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;CHECK: vmov.i32
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;CHECK: vmov
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;CHECK-NEXT: vmov
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;CHECK: bx
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define <16 x i8> @select_s_v_v(<16 x i8> %vec, i32 %avail) {
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entry:
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%and = and i32 %avail, 1
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%tobool = icmp eq i32 %and, 0
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%ret = select i1 %tobool, <16 x i8> %vec, <16 x i8> zeroinitializer
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ret <16 x i8> %ret
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}
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