diff options
| -rw-r--r-- | lib/Target/PowerPC/README.txt | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/README.txt b/lib/Target/PowerPC/README.txt index 3d0736d65e..b23b9a4cc4 100644 --- a/lib/Target/PowerPC/README.txt +++ b/lib/Target/PowerPC/README.txt @@ -402,3 +402,28 @@ Implement TargetConstantVec, and set up PPC to custom lower ConstantVec into TargetConstantVec's if it's one of the many forms that are algorithmically computable using the spiffy altivec instructions. +===-------------------------------------------------------------------------=== + +Compile this: + +double %test(double %X) { + %Y = cast double %X to long + %Z = cast long %Y to double + ret double %Z +} + +to this: + +_test: + fctidz f0, f1 + stfd f0, -8(r1) + lwz r2, -4(r1) + lwz r3, -8(r1) + stw r2, -12(r1) + stw r3, -16(r1) + lfd f0, -16(r1) + fcfid f1, f0 + blr + +without the lwz/stw's. + |