Changes in directory llvm/lib/Target/PowerPC:
PPCInstr64Bit.td updated: 1.7 -> 1.8
---
Log message:
Add some more immediate patterns. This allows us to compile:
void test6() {
Y = 0xABCD0123BCDE4567;
}
into:
_test6:
lis r2, -21555
lis r3, ha16(_Y)
ori r2, r2, 291
rldicr r2, r2, 32, 31
oris r2, r2, 48350
ori r2, r2, 17767
std r2, lo16(_Y)(r3)
blr
---
Diffs of the changes: (+30 -0)
PPCInstr64Bit.td | 30 ++++++++++++++++++++++++++++++
1 files changed, 30 insertions(+)
Index: llvm/lib/Target/PowerPC/PPCInstr64Bit.td
diff -u llvm/lib/Target/PowerPC/PPCInstr64Bit.td:1.7
llvm/lib/Target/PowerPC/PPCInstr64Bit.td:1.8
--- llvm/lib/Target/PowerPC/PPCInstr64Bit.td:1.7 Tue Jun 20 17:38:59 2006
+++ llvm/lib/Target/PowerPC/PPCInstr64Bit.td Tue Jun 20 18:03:01 2006
@@ -215,6 +215,17 @@
// Instruction Patterns
//
+def HI32_48 : SDNodeXForm<imm, [{
+ // Transformation function: shift the immediate value down into the low bits.
+ return getI32Imm((unsigned short)(N->getValue() >> 32));
+}]>;
+
+def HI48_64 : SDNodeXForm<imm, [{
+ // Transformation function: shift the immediate value down into the low bits.
+ return getI32Imm((unsigned short)(N->getValue() >> 48));
+}]>;
+
+
// Immediate support.
// Handled above:
// sext(0x0000_0000_0000_FFFF, i8) -> li imm
@@ -234,6 +245,25 @@
def : Pat<(i64 zext_0x0000_0000_FFFF_7FFF_i16:$imm),
(ORIS8 (LI8 (LO16 imm:$imm)), (HI16 imm:$imm))>;
+// zext(0x0000_0000_FFFF_FFFF, i16) -> oris (ori (li 0), lo16(imm)), imm>>16
+def zext_0x0000_0000_FFFF_FFFF_i16 : PatLeaf<(imm), [{
+ return (N->getValue() & 0xFFFFFFFF00000000ULL) == 0;
+}]>;
+def : Pat<(i64 zext_0x0000_0000_FFFF_FFFF_i16:$imm),
+ (ORIS8 (ORI8 (LI8 0), (LO16 imm:$imm)), (HI16 imm:$imm))>;
+
+
+// Fully general (and most expensive: 6 instructions!) immediate pattern.
+def : Pat<(i64 imm:$imm),
+ (ORI8
+ (ORIS8
+ (RLDICR
+ (ORI8
+ (LIS8 (HI48_64 imm:$imm)),
+ (HI32_48 imm:$imm)),
+ 32, 31),
+ (HI16 imm:$imm)),
+ (LO16 imm:$imm))>;
// Extensions and truncates to/from 32-bit regs.
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