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59 lines
1.9 KiB
59 lines
1.9 KiB
From 2fd1041a8d9684978546886d58fdf8add8c8d9f7 Mon Sep 17 00:00:00 2001 |
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From: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> |
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Date: Tue, 5 Jul 2016 21:20:41 +0530 |
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Subject: [PATCH] powerpc: Fix return code of strcasecmp for unaligned inputs |
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If the input values are unaligned and if there are null characters in the |
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memory before the starting address of the input values, strcasecmp |
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gives incorrect return code. Fixed it by adding mask the bits that |
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are not part of the string. |
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(cherry picked from commit 30e4cc5413f72c2c728a544389da0c48500d9904) |
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--- |
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ChangeLog | 6 ++++++ |
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sysdeps/powerpc/powerpc64/power8/strcasecmp.S | 17 ++++++++++++++--- |
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2 files changed, 20 insertions(+), 3 deletions(-) |
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diff --git a/ChangeLog b/ChangeLog |
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index 9385bd0..af5f694 100644 |
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diff --git a/sysdeps/powerpc/powerpc64/power8/strcasecmp.S b/sysdeps/powerpc/powerpc64/power8/strcasecmp.S |
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index 63f6217..c83dc52 100644 |
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--- a/sysdeps/powerpc/powerpc64/power8/strcasecmp.S |
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+++ b/sysdeps/powerpc/powerpc64/power8/strcasecmp.S |
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@@ -40,11 +40,20 @@ |
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vsel v5, v7, v5, v8; \ |
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vcmpequb. v7, v5, v4; |
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-/* Get 16 bytes for unaligned case. */ |
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+/* |
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+ * Get 16 bytes for unaligned case. |
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+ * reg1: Vector to hold next 16 bytes. |
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+ * reg2: Address to read from. |
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+ * reg3: Permute control vector. |
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+ * v8: Tmp vector used to mask unwanted bytes. |
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+ * v9: Tmp vector,0 when null is found on first 16 bytes |
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+ */ |
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#ifdef __LITTLE_ENDIAN__ |
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#define GET16BYTES(reg1, reg2, reg3) \ |
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lvx reg1, 0, reg2; \ |
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- vcmpequb. v8, v0, reg1; \ |
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+ vspltisb v8, -1; \ |
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+ vperm v8, v8, reg1, reg3; \ |
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+ vcmpequb. v8, v0, v8; \ |
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beq cr6, 1f; \ |
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vspltisb v9, 0; \ |
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b 2f; \ |
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@@ -57,7 +66,9 @@ |
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#else |
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#define GET16BYTES(reg1, reg2, reg3) \ |
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lvx reg1, 0, reg2; \ |
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- vcmpequb. v8, v0, reg1; \ |
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+ vspltisb v8, -1; \ |
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+ vperm v8, reg1, v8, reg3; \ |
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+ vcmpequb. v8, v0, v8; \ |
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beq cr6, 1f; \ |
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vspltisb v9, 0; \ |
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b 2f; \ |
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-- |
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2.1.0 |
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