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https://github.com/c64scene-ar/llvm-6502.git
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77c4ef8a47
The primitive conservative heuristic seems to give a slight overall improvement while not regressing stuff. Make it available to wider testing. If you notice any speed regressions (or significant code size regressions) let me know! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156258 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
1.5 KiB
LLVM
64 lines
1.5 KiB
LLVM
; RUN: llc -march=x86-64 -mcpu=core2 < %s | FileCheck %s
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; cmp with single-use load, should not form cmov.
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define i32 @test1(double %a, double* nocapture %b, i32 %x, i32 %y) {
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%load = load double* %b, align 8
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%cmp = fcmp olt double %load, %a
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%cond = select i1 %cmp, i32 %x, i32 %y
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ret i32 %cond
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; CHECK: test1:
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; CHECK: ucomisd
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; CHECK-NOT: cmov
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; CHECK: j
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; CHECK-NOT: cmov
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}
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; Sanity check: no load.
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define i32 @test2(double %a, double %b, i32 %x, i32 %y) {
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%cmp = fcmp ogt double %a, %b
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%cond = select i1 %cmp, i32 %x, i32 %y
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ret i32 %cond
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; CHECK: test2:
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; CHECK: ucomisd
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; CHECK: cmov
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}
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; Multiple uses of %a, should not form cmov.
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define i32 @test3(i32 %a, i32* nocapture %b, i32 %x) {
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%load = load i32* %b, align 4
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%cmp = icmp ult i32 %load, %a
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%cond = select i1 %cmp, i32 %a, i32 %x
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ret i32 %cond
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; CHECK: test3:
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; CHECK: cmpl
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; CHECK-NOT: cmov
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; CHECK: j
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; CHECK-NOT: cmov
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}
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; Multiple uses of the load.
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define i32 @test4(i32 %a, i32* nocapture %b, i32 %x, i32 %y) {
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%load = load i32* %b, align 4
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%cmp = icmp ult i32 %load, %a
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%cond = select i1 %cmp, i32 %x, i32 %y
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%add = add i32 %cond, %load
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ret i32 %add
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; CHECK: test4:
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; CHECK: cmpl
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; CHECK: cmov
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}
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; Multiple uses of the cmp.
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define i32 @test5(i32 %a, i32* nocapture %b, i32 %x, i32 %y) {
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%load = load i32* %b, align 4
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%cmp = icmp ult i32 %load, %a
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%cmp1 = icmp ugt i32 %load, %a
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%cond = select i1 %cmp1, i32 %a, i32 %y
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%cond5 = select i1 %cmp, i32 %cond, i32 %x
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ret i32 %cond5
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; CHECK: test5:
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; CHECK: cmpl
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; CHECK: cmov
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; CHECK: cmov
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}
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