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llvm-project/llvm/test/CodeGen/Mips/sel2c.ll

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Make all the conditional Mips 16 branches get initially set for the short form. Constant islands will expand them if they are out of range. Since there is not direct object emitter at this time, it does not have any material affect because the assembler sorts this out. But we need to know for the actual constant island work. We track the difference by putting # 16 inst in the comments. llvm-svn: 194766
2013-11-15 10:21:52 +08:00
; RUN: llc -mtriple=mipsel-linux-gnu -march=mipsel -mcpu=mips16 -soft-float -mips16-hard-float -relocation-model=pic -mips16-constant-islands < %s | FileCheck %s -check-prefix=cond-b-short
@i = global i32 1, align 4
@j = global i32 2, align 4
@k = common global i32 0, align 4
; Function Attrs: nounwind optsize
define void @t() #0 {
entry:
%0 = load i32* @i, align 4
%1 = load i32* @j, align 4
%cmp = icmp ne i32 %0, %1
[mips] Small code generation improvement for conditional operator (select) in case the operands are constants and its difference is |1|. It should be possible in those cases to rematerialize the result using MIPS's slt and similar instructions. The small update to some of the tests in cmov.ll, sel1c.ll and sel2c.ll was needed otherwise the optimization implemented in this patch would have been triggered (difference between the operands was 1) and that would have changed the semantic of the tests. llvm-svn: 196498
2013-12-05 20:07:05 +08:00
%cond = select i1 %cmp, i32 1, i32 3
Make all the conditional Mips 16 branches get initially set for the short form. Constant islands will expand them if they are out of range. Since there is not direct object emitter at this time, it does not have any material affect because the assembler sorts this out. But we need to know for the actual constant island work. We track the difference by putting # 16 inst in the comments. llvm-svn: 194766
2013-11-15 10:21:52 +08:00
store i32 %cond, i32* @k, align 4
; cond-b-short: btnez $BB0_{{[0-9]+}} # 16 bit inst
ret void
}
attributes #0 = { nounwind optsize "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="true" }