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Diffstat (limited to 'lib/Target/README.txt')
| -rw-r--r-- | lib/Target/README.txt | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 8b5c5ce137..c0a2b760de 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -2274,24 +2274,3 @@ llc time when it gets inlined, because we can use smaller transfers. This also avoids partial register stalls in some important cases. //===---------------------------------------------------------------------===// - -We miss an optzn when lowering divide by some constants. For example: - int test(int x) { return x/10; } - -We produce: - -_test: ## @test -## BB#0: ## %entry - movslq %edi, %rax - imulq $1717986919, %rax, %rax ## imm = 0x66666667 - movq %rax, %rcx - shrq $63, %rcx -** shrq $32, %rax -** sarl $2, %eax - addl %ecx, %eax - ret - -The two starred instructions could be replaced with a "sarl $34, %rax". This -occurs in 186.crafty very frequently. - -//===---------------------------------------------------------------------===// |