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CodeEmitter: mask immediate shifts

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more convenient for constprop and not really any more expensive.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
This commit is contained in:
Alyssa Rosenzweig committed 2024-09-08 10:26:58 -04:00
1 parent a4acd64246
commit 5fbf76ee9e
1 file changed
+10 -8
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CodeEmitter/CodeEmitter/ALUOps.inl
+10 -8
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@@ -301,8 +301,9 @@ public:
xbfiz_helper(true, s, rd, rn, lsb, width);
}
void asr(ARMEmitter::Size s, ARMEmitter::Register rd, ARMEmitter::Register rn, uint32_t shift) {
LOGMAN_THROW_A_FMT(shift <= RegSizeInBits(s), "Tried to asr a region larger than the register");
sbfm(s, rd, rn, shift, RegSizeInBits(s) - 1);
const auto RegSize_m1 = RegSizeInBits(s) - 1;
shift &= RegSize_m1;
sbfm(s, rd, rn, shift, RegSize_m1);
}
void uxtb(ARMEmitter::Size s, ARMEmitter::Register rd, ARMEmitter::Register rn) {
@@ -325,14 +326,14 @@ public:
}
void lsl(ARMEmitter::Size s, ARMEmitter::Register rd, ARMEmitter::Register rn, uint32_t shift) {
const auto RegSize = RegSizeInBits(s);
LOGMAN_THROW_A_FMT(shift < RegSize, "Tried to lsl a region larger than the register");
ubfm(s, rd, rn, (RegSize - shift) % RegSize, RegSize - shift - 1);
const auto RegSize_m1 = RegSizeInBits(s) - 1;
shift &= RegSize_m1;
ubfm(s, rd, rn, (RegSizeInBits(s) - shift) & RegSize_m1, RegSize_m1 - shift);
}
void lsr(ARMEmitter::Size s, ARMEmitter::Register rd, ARMEmitter::Register rn, uint32_t shift) {
const auto RegSize = RegSizeInBits(s);
LOGMAN_THROW_A_FMT(shift < RegSize, "Tried to lsr a region larger than the register");
ubfm(s, rd, rn, shift, RegSize - 1);
const auto RegSize_m1 = RegSizeInBits(s) - 1;
shift &= RegSize_m1;
ubfm(s, rd, rn, shift, RegSize_m1);
}
void ubfx(ARMEmitter::Size s, ARMEmitter::Register rd, ARMEmitter::Register rn, uint32_t lsb, uint32_t width) {
LOGMAN_THROW_A_FMT(width > 0, "ubfx needs width > 0");
@@ -368,6 +369,7 @@ public:
}
void ror(ARMEmitter::Size s, ARMEmitter::Register rd, ARMEmitter::Register rn, uint32_t Imm) {
Imm &= RegSizeInBits(s) - 1;
extr(s, rd, rn, rn, Imm);
}