c1dc267258
Using this in RegAlloc fast reduces register pressure, and in some cases allows x86 code to compile that wouldn't before.
48 lines
1.2 KiB
LLVM
48 lines
1.2 KiB
LLVM
; RUN: llc -O0 -mtriple=x86_64-linux -asm-verbose=false -verify-machineinstrs < %s | FileCheck %s
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; RUN: llc -O0 -mtriple=x86_64-windows-itanium -asm-verbose=false -verify-machineinstrs < %s | FileCheck %s
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; Fast-isel mustn't add a block to the MBB successor/predecessor list twice.
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; The machine verifier will catch and complain about this case.
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; CHECK-LABEL: baz
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; CHECK: retq
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define void @baz() {
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entry:
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br i1 undef, label %exit, label %exit
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exit:
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ret void
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}
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; rdar://8337108
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; Fast-isel shouldn't try to look through the compare because it's in a
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; different basic block, so its operands aren't necessarily exported
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; for cross-block usage.
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; CHECK: movb %al, [[OFS:[0-9]*]](%rsp)
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; CHECK: callq {{_?}}bar
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; CHECK: movb [[OFS]](%rsp), %al
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declare void @bar()
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define void @foo(i32 %a, i32 %b) nounwind personality i32 (...)* @__gxx_personality_v0 {
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entry:
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%q = add i32 %a, 7
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%r = add i32 %b, 9
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%t = icmp ult i32 %q, %r
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invoke void @bar() to label %next unwind label %unw
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next:
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br i1 %t, label %true, label %return
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true:
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call void @bar()
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br label %return
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return:
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ret void
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unw:
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%exn = landingpad {i8*, i32}
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cleanup
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unreachable
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}
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declare i32 @__gxx_personality_v0(...)
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