derek.holloway
7502bf64a4
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59 lines
1.9 KiB
LLVM
59 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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; RUN: llc -mtriple=riscv64 -stop-after=finalize-isel -o - %s | FileCheck %s
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; Verifies that (mul x, 2^c) -> (shl x, c) fold fires
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; for nsw, nuw, and plain mul by power-of-two, including the signed-minimum
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; boundary case.
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define i64 @mul_nsw_pow2(i64 %x) {
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; CHECK-LABEL: name: mul_nsw_pow2
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; CHECK: bb.0 (%ir-block.0):
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; CHECK-NEXT: liveins: $x10
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr = COPY $x10
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; CHECK-NEXT: [[SLLI:%[0-9]+]]:gpr = nsw SLLI [[COPY]], 2
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; CHECK-NEXT: $x10 = COPY [[SLLI]]
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; CHECK-NEXT: PseudoRET implicit $x10
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%mul = mul nsw i64 %x, 4
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ret i64 %mul
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}
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define i64 @mul_nsw_pow2_signmin(i64 %x) {
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; CHECK-LABEL: name: mul_nsw_pow2_signmin
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; CHECK: bb.0 (%ir-block.0):
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; CHECK-NEXT: liveins: $x10
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr = COPY $x10
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; CHECK-NEXT: [[SLLI:%[0-9]+]]:gpr = SLLI [[COPY]], 63
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; CHECK-NEXT: $x10 = COPY [[SLLI]]
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; CHECK-NEXT: PseudoRET implicit $x10
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%mul = mul nsw i64 %x, -9223372036854775808
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ret i64 %mul
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}
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define i64 @mul_no_flags_pow2(i64 %x) {
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; CHECK-LABEL: name: mul_no_flags_pow2
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; CHECK: bb.0 (%ir-block.0):
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; CHECK-NEXT: liveins: $x10
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr = COPY $x10
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; CHECK-NEXT: [[SLLI:%[0-9]+]]:gpr = SLLI [[COPY]], 2
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; CHECK-NEXT: $x10 = COPY [[SLLI]]
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; CHECK-NEXT: PseudoRET implicit $x10
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%mul = mul i64 %x, 4
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ret i64 %mul
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}
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define i64 @mul_nuw_pow2(i64 %x) {
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; CHECK-LABEL: name: mul_nuw_pow2
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; CHECK: bb.0 (%ir-block.0):
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; CHECK-NEXT: liveins: $x10
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; CHECK-NEXT: {{ $}}
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; CHECK-NEXT: [[COPY:%[0-9]+]]:gpr = COPY $x10
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; CHECK-NEXT: [[SLLI:%[0-9]+]]:gpr = nuw SLLI [[COPY]], 2
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; CHECK-NEXT: $x10 = COPY [[SLLI]]
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; CHECK-NEXT: PseudoRET implicit $x10
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%mul = mul nuw i64 %x, 4
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ret i64 %mul
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}
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