Giacomo Travaglini has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/64612?usp=email )
Change subject: arch-arm: Fix QDADD implementation
......................................................................
arch-arm: Fix QDADD implementation
This got broken by a recent commit [1] which converted a bitwise
OR into the boolean version. While it conceptually made sense
as the saturateOp returns a boolean value, it is not taking
into consideration that saturateOp modifies the first argument
and the boolean version short-circuits the expression preventing
the second expression from being run if the first one is true
Therefore providing an incorrect midRes value.
[1]: https://gem5-review.googlesource.com/c/public/gem5/+/64172
Change-Id: Ibb9b3d37dcccda006006650ef759cdfe385dcfe2
Signed-off-by: Giacomo Travaglini <giacomo.travagl...@arm.com>
---
M src/arch/arm/isa/insts/data.isa
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/src/arch/arm/isa/insts/data.isa
b/src/arch/arm/isa/insts/data.isa
index 066a2ab..86f14d0 100644
--- a/src/arch/arm/isa/insts/data.isa
+++ b/src/arch/arm/isa/insts/data.isa
@@ -342,8 +342,9 @@
''', flagType="none", buildCc=False)
buildRegDataInst("qdadd", '''
int32_t midRes;
- resTemp = saturateOp<32>(midRes, Op2_sw, Op2_sw) ||
- saturateOp<32>(midRes, Op1_sw, midRes);
+ const bool res0 = saturateOp<32>(midRes, Op2_sw, Op2_sw);
+ const bool res1 = saturateOp<32>(midRes, Op1_sw, midRes);
+ resTemp = (res0 || res1) ? 1 : 0;
Dest = midRes;
''', flagType="saturate", buildNonCc=False)
buildRegDataInst("qsub", '''
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: Ibb9b3d37dcccda006006650ef759cdfe385dcfe2
Gerrit-Change-Number: 64612
Gerrit-PatchSet: 1
Gerrit-Owner: Giacomo Travaglini <giacomo.travagl...@arm.com>
Gerrit-MessageType: newchange
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