Mercurial > hg > CbC > CbC_llvm
view test/Transforms/InstCombine/preserve-sminmax.ll @ 147:c2174574ed3a
LLVM 10
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Wed, 14 Aug 2019 16:55:33 +0900 |
parents | 95c75e76d11b |
children |
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; RUN: opt < %s -instcombine -S | FileCheck %s ; Instcombine normally would fold the sdiv into the comparison, ; making "icmp slt i32 %h, 2", but in this case the sdiv has ; another use, so it wouldn't a big win, and it would also ; obfuscate an otherise obvious smax pattern to the point where ; other analyses wouldn't recognize it. define i32 @foo(i32 %h) { %sd = sdiv i32 %h, 2 %t = icmp slt i32 %sd, 1 %r = select i1 %t, i32 %sd, i32 1 ret i32 %r } ; CHECK: %sd = sdiv i32 %h, 2 ; CHECK: %t = icmp slt i32 %sd, 1 ; CHECK: %r = select i1 %t, i32 %sd, i32 1 ; CHECK: ret i32 %r define i32 @bar(i32 %h) { %sd = sdiv i32 %h, 2 %t = icmp sgt i32 %sd, 1 %r = select i1 %t, i32 %sd, i32 1 ret i32 %r } ; CHECK: %sd = sdiv i32 %h, 2 ; CHECK: %t = icmp sgt i32 %sd, 1 ; CHECK: %r = select i1 %t, i32 %sd, i32 1 ; CHECK: ret i32 %r