mirror of
https://github.com/c64scene-ar/llvm-6502.git
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e0c643d503
my C-brain happy. Remove the unnecessary bits of pedantic IR fluff like nounwind. Remove stray uses comments. Name things semantically rather than tN so that adding a new test in the middle doesn't cause pain, and so that new tests can be grouped semantically. This exposes how little systematic testing is going on here. I noticed this by finding several bugs via inspection and wondering why this test wasn't catching any of them. =[ git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147248 91177308-0d34-0410-b5e6-96231b3b80d8
90 lines
1.9 KiB
LLVM
90 lines
1.9 KiB
LLVM
; RUN: llc < %s -march=x86 -mcpu=yonah | FileCheck %s
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declare i32 @llvm.cttz.i32(i32, i1)
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declare i16 @llvm.ctlz.i16(i16, i1)
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declare i32 @llvm.ctlz.i32(i32, i1)
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define i32 @cttz_i32(i32 %x) {
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%tmp = call i32 @llvm.cttz.i32( i32 %x, i1 true )
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ret i32 %tmp
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; CHECK: cttz_i32:
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; CHECK: bsfl
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; CHECK-NOT: cmov
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; CHECK: ret
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}
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define i16 @ctlz_i16(i16 %x, i16 %y) {
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entry:
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%tmp1 = add i16 %x, %y
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%tmp2 = call i16 @llvm.ctlz.i16( i16 %tmp1, i1 true )
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ret i16 %tmp2
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; CHECK: ctlz_i16:
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; CHECK: bsrw
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; CHECK-NOT: cmov
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; CHECK: xorl $15,
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; CHECK: ret
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}
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define i32 @ctlz_i32(i32 %x) {
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%tmp = call i32 @llvm.ctlz.i32( i32 %x, i1 true )
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ret i32 %tmp
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; CHECK: ctlz_i32:
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; CHECK: bsrl
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; CHECK-NOT: cmov
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; CHECK: xorl $31,
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; CHECK: ret
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}
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define i32 @ctlz_i32_cmov(i32 %n) {
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entry:
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; Generate a cmov to handle zero inputs when necessary.
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; CHECK: ctlz_i32_cmov:
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; CHECK: bsrl
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; CHECK: cmov
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; CHECK: xorl $31,
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; CHECK: ret
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%tmp1 = call i32 @llvm.ctlz.i32(i32 %n, i1 false)
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ret i32 %tmp1
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}
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define i32 @ctlz_i32_fold_cmov(i32 %n) {
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entry:
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; Don't generate the cmovne when the source is known non-zero (and bsr would
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; not set ZF).
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; rdar://9490949
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; CHECK: ctlz_i32_fold_cmov:
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; CHECK: bsrl
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; CHECK-NOT: cmov
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; CHECK: xorl $31,
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; CHECK: ret
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%or = or i32 %n, 1
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%tmp1 = call i32 @llvm.ctlz.i32(i32 %or, i1 false)
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ret i32 %tmp1
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}
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define i32 @ctlz_bsr(i32 %n) {
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entry:
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; Don't generate any xors when a 'ctlz' intrinsic is actually used to compute
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; the most significant bit, which is what 'bsr' does natively.
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; CHECK: ctlz_bsr:
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; CHECK: bsrl
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; CHECK-NOT: xorl
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; CHECK: ret
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%ctlz = call i32 @llvm.ctlz.i32(i32 %n, i1 true)
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%bsr = xor i32 %ctlz, 31
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ret i32 %bsr
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}
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define i32 @ctlz_bsr_cmov(i32 %n) {
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entry:
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; Same as ctlz_bsr, but ensure this happens even when there is a potential
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; zero.
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; CHECK: ctlz_bsr_cmov:
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; CHECK: bsrl
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; CHECK-NOT: xorl
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; CHECK: ret
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%ctlz = call i32 @llvm.ctlz.i32(i32 %n, i1 false)
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%bsr = xor i32 %ctlz, 31
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ret i32 %bsr
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}
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