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https://github.com/RPCS3/llvm-mirror.git
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0c16dcd701
This provides an optimized implementation of SADDO/SSUBO/UADDO/USUBO as well as ADDCARRY/SUBCARRY on top of the new CC implementation. In particular, multi-word arithmetic now uses UADDO/ADDCARRY instead of the old ADDC/ADDE logic, which means we no longer need to use "glue" links for those instructions. This also allows making full use of the memory-based instructions like ALSI, which couldn't be recognized due to limitations in the DAG matcher previously. Also, the llvm.sadd.with.overflow et.al. intrinsincs now expand to directly using the ADD instructions and checking for a CC 3 result. llvm-svn: 331203
83 lines
2.1 KiB
LLVM
83 lines
2.1 KiB
LLVM
; Test the three-operand form of 32-bit subtraction.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
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declare i32 @foo(i32, i32, i32)
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; Check SLRK.
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define i32 @f1(i32 %dummy, i32 %a, i32 %b, i32 *%flag) {
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; CHECK-LABEL: f1:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: afi [[REG]], -536870912
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; CHECK: srl [[REG]], 31
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; CHECK: st [[REG]], 0(%r5)
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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%ext = zext i1 %obit to i32
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store i32 %ext, i32 *%flag
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ret i32 %val
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}
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; Check using the overflow result for a branch.
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define i32 @f2(i32 %dummy, i32 %a, i32 %b) {
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; CHECK-LABEL: f2:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK-NEXT: bnler %r14
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; CHECK: lhi %r2, 0
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; CHECK: jg foo@PLT
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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br i1 %obit, label %call, label %exit
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call:
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%res = tail call i32 @foo(i32 0, i32 %a, i32 %b)
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ret i32 %res
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exit:
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ret i32 %val
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}
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; ... and the same with the inverted direction.
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define i32 @f3(i32 %dummy, i32 %a, i32 %b) {
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; CHECK-LABEL: f3:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK-NEXT: bler %r14
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; CHECK: lhi %r2, 0
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; CHECK: jg foo@PLT
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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br i1 %obit, label %exit, label %call
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call:
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%res = tail call i32 @foo(i32 0, i32 %a, i32 %b)
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ret i32 %res
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exit:
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ret i32 %val
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}
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; Check that we can still use SLR in obvious cases.
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define i32 @f4(i32 %a, i32 %b, i32 *%flag) {
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; CHECK-LABEL: f4:
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; CHECK: slr %r2, %r3
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: afi [[REG]], -536870912
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; CHECK: srl [[REG]], 31
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; CHECK: st [[REG]], 0(%r4)
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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%ext = zext i1 %obit to i32
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store i32 %ext, i32 *%flag
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ret i32 %val
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}
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declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32) nounwind readnone
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