29 lines
791 B
Plaintext
29 lines
791 B
Plaintext
test binemit
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set opt_level=best
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target x86_64
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; Test that instruction shrinking eliminates REX prefixes when possible.
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; The binary encodings can be verified with the command:
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;
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; sed -ne 's/^ *; asm: *//p' filetests/isa/x86/shrink.clif | llvm-mc -show-encoding -triple=x86_64
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;
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function %test_shrinking(i32) -> i32 {
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ebb0(v0: i32 [ %rdi ]):
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; asm: movl $0x2,%eax
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[-,%rcx] v1 = iconst.i32 2 ; bin: b9 00000002
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; asm: subl %ecx,%edi
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[-,%rdi] v2 = isub v0, v1 ; bin: 29 cf
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return v2
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}
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function %test_not_shrinking(i32) -> i32 {
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ebb0(v0: i32 [ %r8 ]):
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; asm: movl $0x2,%eax
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[-,%rcx] v1 = iconst.i32 2 ; bin: b9 00000002
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; asm: subl %ecx,%edi
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[-,%r8] v2 = isub v0, v1 ; bin: 41 29 c8
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return v2
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}
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