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45 lines
1.3 KiB
45 lines
1.3 KiB
4 months ago
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
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; RUN: | FileCheck %s -check-prefix=RV64I
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; These tests must not compile to sllw/srlw/sraw, as this would be semantically
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; incorrect in the case that %b holds a value between 32 and 63. Selection
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; patterns might make the mistake of assuming that a (sext_inreg foo, i32) can
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; only be produced when sign-extending an i32 type.
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define i64 @tricky_shl(i64 %a, i64 %b) nounwind {
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; RV64I-LABEL: tricky_shl:
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; RV64I: # %bb.0:
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; RV64I-NEXT: sll a0, a0, a1
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; RV64I-NEXT: sext.w a0, a0
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; RV64I-NEXT: ret
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%1 = shl i64 %a, %b
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%2 = shl i64 %1, 32
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%3 = ashr i64 %2, 32
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ret i64 %3
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}
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define i64 @tricky_lshr(i64 %a, i64 %b) nounwind {
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; RV64I-LABEL: tricky_lshr:
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; RV64I: # %bb.0:
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; RV64I-NEXT: slli a0, a0, 32
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; RV64I-NEXT: srli a0, a0, 32
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; RV64I-NEXT: srl a0, a0, a1
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; RV64I-NEXT: ret
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%1 = and i64 %a, 4294967295
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%2 = lshr i64 %1, %b
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ret i64 %2
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}
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define i64 @tricky_ashr(i64 %a, i64 %b) nounwind {
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; RV64I-LABEL: tricky_ashr:
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; RV64I: # %bb.0:
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; RV64I-NEXT: sext.w a0, a0
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; RV64I-NEXT: sra a0, a0, a1
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; RV64I-NEXT: ret
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%1 = shl i64 %a, 32
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%2 = ashr i64 %1, 32
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%3 = ashr i64 %2, %b
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ret i64 %3
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}
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