3f3e85cd23
For i64 this avoids loading a 64-bit value into register, for smaller registers this just avoids an immediate operand. For i8+i16, limit to one use case as we save fewer bytes and these can be wasted entirely on extra register moves. Fixes #67709
46 lines
1.3 KiB
LLVM
46 lines
1.3 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s
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; RUN: llc < %s -mtriple=x86_64-win32 | FileCheck %s
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; The comparison uses the pre-inc value, which could lead LSR to
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; try to compute -INT64_MIN.
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; CHECK-NOT: movabsq $-9223372036854775808, %rax
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; CHECK: negq %r
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; CHECK-NEXT: seto %al
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declare i64 @bar()
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define i1 @foo() nounwind {
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entry:
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br label %for.cond.i
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for.cond.i:
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%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.cond.i ]
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%t = call i64 @bar()
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%indvar.next = add i64 %indvar, 1
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%s = icmp ne i64 %indvar.next, %t
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br i1 %s, label %for.cond.i, label %__ABContainsLabel.exit
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__ABContainsLabel.exit:
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%cmp = icmp eq i64 %indvar, 9223372036854775807
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ret i1 %cmp
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}
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define void @func_37() noreturn nounwind readonly {
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entry:
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br label %for.body
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for.body: ; preds = %for.inc8, %entry
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%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.inc8 ]
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%sub.i = add i64 undef, %indvar
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%cmp.i = icmp eq i64 %sub.i, -9223372036854775808
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br i1 undef, label %for.inc8, label %for.cond4
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for.cond4: ; preds = %for.cond4, %for.body
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br label %for.cond4
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for.inc8: ; preds = %for.body
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%indvar.next = add i64 %indvar, 1
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br label %for.body
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}
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