4e67e08efd
This switches from a custom list of architectures to use the target-lexicon crate. - "set is_64bit=1; isa x86" is replaced with "target x86_64", and similar for other architectures, and the `is_64bit` flag is removed entirely. - The `is_compressed` flag is removed too; it's no longer being used to control REX prefixes on x86-64, ARM and Thumb are separate architectures in target-lexicon, and we can figure out how to select RISC-V compressed encodings when we're ready.
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.cton | 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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